Peroxidizing phytotoxic activity of 1, 3, 4-thiadiazolidine-2-thiones and 1, 2, 4-triazolidine-3, 5-dithiones
1995
Ihara, T. (Tamagawa Univ., Machida, Tokyo (Japan). Faculty of Agriculture) | Iida, T. | Takasuka, S. | Kohno, H. | Sato, Y. | Nicolaus, B. | Boeger, P. | Wakabayashi, K.
Using autotrophic Scenedesmus acutus cells incubated in the light and Echinochloa utilis culture, a series of isomeric compounds, namely 5-arylimino-3,4-tetramethylene-1,3,4-thiadiazolidine-2-thion es (thiadiazolidine-thiones) and 4-aryl-1,2-tetramethylene-1,2,4-triazolidine-3,5-dithiones (triazolidine-dithiones), were assayed with respect to growth inhibition, decrease of chlorophyll content, protoporphyrin-IX accumulation and light-induced ethane formation level. The both types of phytotoxic compounds decreed chlorophyll contents, caused protoporphyrin-IX accumulation and ethane evolution, and inhibited growth of Scenedesmus cells. They inhibited also protoporphyrinogen-IX oxidase, which led to rapid accumulation of protoporphyrin-IX, an intermediate of chlorophyll biosynthesis, just like peroxidizing herbicides such as p-nitrodiphenyl ethers and cyclic imides. Our comparative data on different sets of the aforementioned parameters suggest that both the thiadiazolidine-thiones and triazolidine-dithiones are grouped as peroxidizing herbicides, affecting a crucial enzyme in the chlorophyll biosynthesis and inducing ethane formation by cell membrane destruction
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